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Updated 3/6/2026

Superfamily Rissooidea

Family Rissoidae, Rissoinidae, Zebinidae

These herbivorous micromollusks are associated with rocks and rubble.  Their small size makes identification a challenge.  Glassy shells become white when abraded.

 

HAWAII - ENDEMIC

Simularmerelina granulosa

GRANULOSE RISSO

 

 Bittinella hiloensis

HILO RISSO
   

INDO-PACIFIC / HAWAII

Rissoina ambigua

 

AMBIGUOUS RISSO

 

 Apataxia cerithiiformis

 

OCHRE-BANDED RISSO
Rissoina costata

 

RIBBED RISSO

 Pandalosia ephamilla  

EPHAMILLA RISSO

 
Parashiela ambulata

BEETS' RISSO

 

 Schwartziella triticea  

TRIPLE RISSO
Sulcorissoina imbricata

STRIATED RISSO

 

 Zebina tridentata  

THREE-TOOTHED RISSO
Haruakia marmorata

MARBLED RISSO

 

  
   

Family Pickworthiidae

Cave shells

These tiny micromollusks were once lumped together within Family Rissoidae.  Their biology is unknown, with empty shells collected from sediment in deep caves.

 

HAWAII - ENDEMIC

Mareleptopoma kenneyi

KENNEY'S CAVE SHELL